Pressure Tuning of the Interplay of Magnetism and Superconductivity in CeCu2Si2

TL;DR

This study investigates how pressure influences the relationship between magnetism and superconductivity in CeCu2Si2, revealing quantum critical points and their connection to the emergence of superconductivity.

Contribution

It provides experimental evidence of pressure-tuned quantum critical points and their extension into the superconducting state in CeCu2Si2.

Findings

Identification of magnetic-field- and pressure-tuned quantum critical points

Evidence for the extension of quantum criticality into the superconducting state

Close connection between antiferromagnetism and superconductivity mechanisms

Abstract

We carried out specific-heat and ac-susceptibility experiments under hydrostatic pressure to investigate the interplay of spin-density-wave antiferromagnetism (A) and superconductivity (S) in single-crystalline AS-type CeCu2Si2. We find evidence for a line of magnetic-field- and pressure-tuned quantum critical points in the normal state in the zero-temperature magnetic field-pressure plane. Our analysis suggests an extension of this line into the superconducting state and corroborates the close connection of the underlying mechanisms leading to the formation of the antiferromagnetic and the superconducting states in AS-type CeCu2Si2.